diff --git a/module_build_service/builder/MockModuleBuilder.py b/module_build_service/builder/MockModuleBuilder.py
index f3a48ae3..c4804b7c 100644
--- a/module_build_service/builder/MockModuleBuilder.py
+++ b/module_build_service/builder/MockModuleBuilder.py
@@ -479,7 +479,7 @@ class MockModuleBuilder(GenericBuilder):
                 "$root", "%s-%s" % (self.tag_name, str(threading.current_thread().name)))
             config = config.replace("$arch", self.arch)
             config = config.replace("$group", " ".join(self.groups))
-            config = config.replace("$yum_conf", self.yum_conf)
+            config = config.replace("$yum_conf", self.yum_conf.strip())
             config = config.replace("$enabled_modules", str(self.enabled_modules))
             config = config.replace("$releasever", str(self.releasever))